Rhomboid Intercostal and Subserratus Plane Block Versus Paravertebral Block for Thoracic Herpes Zoster

Postherpetic neuralgia (PHN) is a common and debilitating complication of herpes zoster, characterized by persistent and severe pain. The rhomboid intercostal and subserratus plane (RISS) block, a novel ultrasound-guided regional anesthesia technique, has shown promise for various pain conditions, but its effectiveness for treating thoracic PHN remains relatively unexplored, and comparative studies against Paravertebral (PVB) block are lacking. This study aims to compare the efficacy and safety of RISS block versus PVB block for thoracic herpes zoster.